I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
witan whiten witney widen wheaten
seitan titan sheitan witan shaitan tan litany chitin rattan piton whiten dittany median tetany detain stain cotan ratany radian ratan niton butane botany attain reattain cetane gitano retain tain soutane chiton stane phytane
wit wait whit white whitey whity wite witty twit